Research On Satellite Communication System Based On Hybrid DS/FH Spread Spectrum Technique

The satellite communication can be interfered very easily, so the valid anti-jamming techniques must be studied to resist serious interference. Hybrid DS/FH spread spectrum technique synthesizes the advantages of DS and FH, so it can resist interference more availably. It is also an anti-jamming technique studied more at present. This thesis gives a research on the satellite communication system based on hybrid DS/FH spread spectrum technique. The main work of the thesis includes:1. The research on anti-jamming techniques of satellite communication is given. Through the analysis of the hybrid DS/FH spread spectrum technique, the principle and structure of the system are introduced.2. The key techniques used in the system are discussed in detail, mainly includes soft spread spectrum technique, channel coding and decoding method, TOD technique, DDS technique and so on.3. The frame structure of the signal is introduced. A synchronization scheme of FH suitable for satellite communication is put forward. This scheme combines synchronization-head with TOD. Through the analysis, this scheme has the characteristics that it can make synchronization time short, design easily, capture probability high.4. The anti-jamming performances of the system interfered by multiuser jamming, single-tone jamming, multitone jamming and partial band jamming are simulated. The strong anti-jamming ability of the system is verified after simulating.